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The ecoTEC plus 615 with an output of 15kW is best suited to a well-insulated semi-detached home with one bathroom and one ensuite.

The Vaillant ecoTEC plus system range uses a separate hot water cylinder to store the hot water supply directly supplied from the mains so there is no need for a cold water tank in the loft.

This wall mounted boiler weighs 34.8 kg which is fairly typical of a boiler this size (72 x 44 x 34cm). You will need a clearance of at least 50cm in front of the boiler for an engineer to get in and service it.

This model is available in a smaller 12kW version or with larger outputs ranging from 18-37kW suiting all domestic properties.

Your boiler installer will help determine your central heating and hot water needs.

* This is a guide price for a straightforward, like-for-like boiler replacement. Installation costs will vary dependent on work required.